PROCESS FOR THE PRODUCTION OF MAGNESIUM OXIDE FROM BRINE OR BITTERN

摘要

Magnesium oxide, especially suitable for use in basic refractories, is produced from brine or bittern containing magnesium chloride by: a) adding to the brine or bittern, as a source of MgO and/or CaO, MgO or Mg(OH)2 or calcined magnesite or calcined dolomite or calcined calcite/limestone in such amount that in the case of MgO, Mg(OH)2 or calcined magnesite, the molar ration of MgO:MgCl2 is in the range of 1:1.5 to 1:15 (i.e. 0.66:1 to 0.066:1) or, in the case of calcined calcite/limestone, the molar ration of CaO: MgCl2 is in the range of 0.66:1 to 0.1:1: b) keeping the mixture at a temperature below 90.degree.C till a solid mass is formed; and c) drying the said solid mass at a temperature up to 200.degree.C. The said mass may then be calcined at a maximum temperature of 1200.degree.C and optionally then briquetted with a binder and fired at above1400.degree.C.